Hi @gench1590 ,
Please follow the guide mentioned in the link given below to know the process of getting the token by API flow.
Ref: https://developer.ebay.com/devzone/guides/features-guide/content/basics/Tokens-MultipleUsers.html
Auth'n'Auth tokens is valid for 18 months from the date it was generated.
After the expiration of a Auth'n'Auth token your application needs to take an user to go through Auth&Auth consent flow to get a new token.
Ref: https://developer.ebay.com/DevZone/guides/features-guide/default.html#Basics/Tokens-About.html?
Best Regards ,
eBay Developer Support
